Reviewing concepts: crevice corrosion


Crevice corrosion is one of the most common and less recognized forms of attack on metal. This type of localized corrosion is a problem that usually involves passive metals and before relatively corrosion-resistant materials, for example, stainless steels, titanium and aluminum. For this reason, crevice corrosion is often ignored, leading to premature failure of structures and equipment, sometimes with catastrophic consequences. This type of corrosion occurs also with less corrosion resistant alloys exposed to highly oxidizing or passivating environments. In all case, the occurrence of this problem is confined to very narrow gaps (crevices) which are formed when using gaskets, bolts and washers. Narrow gaps are also present in lap joints and beneath surface deposits, such as sand, porous corrosion products, barnacles and other surface heterogeneities such as cracks, spray welding and other metallurgical defects. To explore this subject more largely, three papers of literature review will be presented covering the following topics:
I Definition, causes and mechanisms;
II. Factors influences;
III. Prevention, control and techniques for measuring the tendency for crevice corrosion.
This paper presents the definition, the main causes and the accepted mechanisms for crevice corrosion.

PECEQUILO, Cristiane Vargas; PANOSSIAN, Zehbour. Revisando conceitos: corrosão em frestas, parte 1. Corrosão e Proteção, n. 10, p. 20-28, jan.-fev., 2013.

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